NormalizedVersion - accept ~ as version separator

Bundle versions are often described as being decimal floats e.g. 1.2,
but they also accept more than one dot, and a suffix after a dash,
e.g. 1.2.3-peru

Debian project and Ubuntu often use ~ for modified sources to comply
with distribution policy (~dfsg), or developer builds.

The dist_source target for setup.py does not work with
a version suffix like ~dfsg, requiring a manual step to rename the
file.

Adjust the regular expression to accept the ~ form.

src/sugar3/bundle/bundleversion.py

@@ -32,7 +32,7 @@ VERSION_RE = re.compile(r'''
     (?P<version>\d+)               # minimum 'N'
     (?P<extraversion>(?:\.\d+)*)   # any number of extra '.N' segments
     (?:
-    (?P<local>\-[a-zA-Z]*)         # ignore any string in the comparison
+    (?P<local>[\-\~].[a-zA-Z]*)    # ignore any string in the comparison
     )?
     $''', re.VERBOSE)
 
@@ -45,6 +45,7 @@ class NormalizedVersion(object):
         1.2
         1.2.3
         1.2.3-peru
+        1.2.3~dfsg
 
     Bad:
         1.2peru        # must be separated with -